On-line and real-time measuring device for pressure and torque for friction stir welding

Abstract

The invention relates to an on-line and real-time measuring device for friction stir welding by taking a numerical control machine tool as a body. According to the on-line and real-time measuring device, the axial pressure and the torque of a stirring head can be detected in real time in the welding process, and the pressure and the friction torque can be controlled by adjusting the downward displacement amount of the stirring head. The on-line and real-time measuring device comprises an on-line collecting and processing module, a signal display and communication module and an upper computer module; two signal real-time sensing units in the on-line collecting and processing module acquire and process detection signals in real time and convert the detection signals into numerical value information of the pressure and the torque; the signal display and communication module is signal digital quantity liquid crystal display, is in communication transmission with an upper computer and has the threshold value monitoring and alarming function; and the upper computer module is used for being in communication with the signal display and communication module, setting the ''zero point'' and the ''threshold value'' of the pressure and the torque and storing the measured numerical value in real time. The on-line and real-time measuring device has the advantage that the pressure and the torque in the friction stir welding process can be detected and displayed in real time, and a detection method is provided for constant-pressure and fixed-torque welding.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a device for online real-time measurement of pressure and torque of friction stir welding. Background technique [0002] Friction stir welding is a new type of solid-phase joining technology, which realizes welding through the frictional heat generated by the high-speed rotating stirring head and the surface of the material to be welded. During the friction stir welding welding process, the stirring head is rotated and inserted into the workpiece to be welded. The friction between the stirring head and the base metal generates heat, which makes the base metal thermally plasticized. When the stirring head moves along the interface to be welded, the plasticized material is stirred The forward side of the head moves to the rear, and the solid phase connection is realized under the axial forging action of the stirring head. This technology has the remarkable characteri...

AI Technical Summary

Problems solved by technology

Large variations in axial pressure during the advance phase due to changes in weld material surface temperature or changes in other process variables can result in inconsistent weld microstructure and tensile strength

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